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Course: Class 12 Physics (India)>Unit 1

Lesson 9: Electric flux and Gauss's law

Electric flux meaning (& how to calculate it)

Electric flux measures how much the electric field 'flows' through an area. The flow is imaginary & calculated as the product of field strength & area component perpendicular to the field. Created by Mahesh Shenoy.

Want to join the conversation?

• Sir why are we integrating the equation??
• Because we are adding up the infinitely tiny squares along the surface of the object which requires an integral.
• I have a question.
Mahesh took the area perpendicular to calculate the flux. If we know the angle, can we just use EAsin theta?
(1 vote)
• Yes. EAsin(theta) will give us the value of perpendicular component of area, so effectively we are doing the same thing.

It also depends on which angle we assume to be theta. Usually, to calculate the flux, we consider area to be a vector (directed normal to the area) and find the flux by taking the dot product of E and A vectors. So that case if theta is the angle between E vector and A vector, flux will be EAcos(theta)